Power-hammer.



No. 788,547. PATENTED MAY 2, 1905.

` 0. P. MIKLEBUST 6a A. G. ANDERSON.

POWER HAMMER.

APPLIUATION FILED JULY 29, 1904.

Z SHEETS-SHEET 1.

Say/H Witnesses w Z/ LMUIV b9 1 entera Httornegs No. 788,547. l PATENTEDMAY 2, 1905. 0. P. MIKLEBOST L A. G. ANDERSON.

POWER HAMMER.

APPLIOATION FILED JULY 29. 1904.

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5f and A771@ 1 ""lfl Inventrg ttomegs UNITED STATES Patented May 2,1905.

PATENT OEEICE.

OLE P. MIKLEBOST AND ANTON G. ANDERSON, OF BROWN VALLEY, MINNESOTA.

POWER-HAMMER.

SPECIFICATION forming part of Letters Patent No. 788,547, dated May 2,1905.

Application filed July 29,1904. Serial No. 218,783.

vANTON G. ANDERSON, citizens of the United States,1esiding at BrownValley, in the county of Traverse and State of Minnesota, have inventeda new and useful Power-Hammer, of

which the following is a specification.

This invention relates to metalworking machines, and is designed toprovide an improved power-hammer capable of being convenieutly throwninto and out of action and also capable of adjustment to vary the strokeof the hammer in accordance with the work in hand.

Another object of the invention is to have each element of the machineseparately controllable, so as to be thrown into and out of operation atwill and to provide for the necessary adjustments to accommodate themachine to the work.

l/Vith these and other objects in view the present invention consists inthe combination and arrangement of parts, as will be hereinafter morefully described, shown in the accompanying drawings. and particularlypointed out in the appended claims, it being' understood that changes inthe form, proportion, size, and minor details may be made within thescope of the claims without departing from the spirit or sacrilicing anyof the advantages of the invention.

In the drawings, Figure 1 is a perspective view of a metal-workingmachine constructed in accordance with the present invention. Fig. 2 isa longitudinal sectional view thereof. Fig. 3 is a cross-sectional viewon the line 3 3 of Fig. 2. Fig. 4 is a detail cross-sectional View onthe line 4 4 of Fig. Q. Fig. 5 is a detail perspective view of atrip-hammer head and a die for cooperation therewith. Fig:I 6 isafragmentary perspective View of one corner of the bed of the machine toillustrate the guideway for the work-holder of4 the tubecutter.

Like characters of reference designate corresponding parts in each andevery figure of the drawings.

The operating parts of the present machine are mounted upon a framewhich includes a skeleton bench or table-top 1, which is open throughoutits longitudinal center and supported at its rear end upon leg-standards2 and 3, while its front end is supported upon a single leg-standard 4,located substantially midway between the opposite longitudinal sides ofthe table-top or bed of the machine.

A vertically-swinging hammer-bar 5 is mounted above the longitudinalcenter of the bed of the machine and has its rear end fulcrumed upon ayoke-shaped bracket 6, the stem 7 of which slidably pierces the rearportion of the top of the bed at the inner side of the upstanding backportion 8 thereof and is provided with a longitudinal slot 9, throughwhich projects a clamping-bolt 10, carried by the back 8 of the bed,whereby the bracket is capable of being adjusted vertically toaccommodate the hammer-bar to the work in hand. The front free end ofthe hammer-bar projects a suitable distance in front of the bed of themachineand carries a hammer-head 11, which is provided with an openingto receive the hammer-bar, and carries a set-screw 12 to adjustably anddetachably hold the hammerhead upon the bar. One end of this hammerheadis concaved, as at 13, for use in scariing the end of a tube, while itsopposite end is enlarged, as at 14, and concaved for use in swaging ascarfed joint. It will therefore be understood that it is necessary toinvert the hammerhead to bring its opposite ends into alternate use, andtherefore it is preferred to have the free extremity of the hammer-armrounded or in the nature of a spindle, as indicated at 15, in order thatthe hammer-head may be rotated upon the bar to bring either end intoposition for use, thereby to obviate the removal of the hammer-head wheninverting the same. A cylindrical mandrel or anvilbar 16 is disposed inlongitudinal alinement below the free end of the hammer-bar and has itsrear end portion dovetailed in crosssection and litted endwise into anopen-ended .dovetailed groove or seat 18 in the top of the front end ofthe bed, whereby the mandrel is rigidly and detachably held in place. lnrear of the mandrel or anvil there is an upstanding slotted guide-bar19, which is secured to the back of the front portion of the bed and hasthe hammer-bar working in the slot thereof to guide the same and obviatelateral play.

In addition to the scarfing and swaging hammer-head 11 there is anotherhammerhead 2O of the ordinary type which may be substituted for thehammer 11, in which event the anvil or mandrel 16 is substituted by thedie-block 21, which has a dovetailed stem 22 to lit in the dovetailedseat 18 of the bed of the machine. Vhen the ordinary hammerhead 20 andthe guide-block 2l are employed to use the device as a trip-hammer thehammer-bar should be shifted rearwardly through the bracket 6 andfulcrumed thereon at the opening 23, formed through the bar, and thebracket should also be elevated to a suitable extent so as to obtain agreater throw of the hammer-bar than is necessary in scariing andswaging a tube.

Power is applied to the hammer-bar from a drive-shaft 24, which has itsforward end journaled in the back of the front leg-standard 4, with itsrear end journaled upon and projected rearwardly beyond a suitablecrossbar 25, extending across the lower portions of the .rearleg-standards. A drive-pulley 26 is fixed upon the shaft intermediate ofits ends and is designed to be driven from any suitable source of power.(Not shown.) In front of the pulley there is a sleeve 27, looselymounted upon the shaft and provided with a longitudinal feather or key28. A clutch member 29 is mounted to slide upon the feathered portion ofthe sleeve into and out of engagement with the adjacent clutch-face ofthe pulley, so as to interlock the sleeve therewith for simultaneousrotation with the shaft. The movable clutch member 29 is governed by anupright swinging arm 30, having its lower end provided with a fork 31,engaging the groove 32 in the clutch member, the upper end of the armbeing connected to a rock-bar 33, journaled across the bottom of the bedand provided at one end with a crank-arm 34. Below the crank-arm is atreadle 35, which has its rear end fulcrumed upon the cross-bar 25 atthe back of the machine, with its front free end projected in front ofthe bed, so as to be in position to be conveniently controlled by thefoot of an operator standing at the front of the machine. A link or rod36 connects the crank-arm and the treadle, and a spring 37 extendsbetween an intermediate portion of the lever and the bottom of the bedto yieldably hold the treadle in an elevated position with the clutchmember 29 out of engagement with the drive-pulley, thereby to render thesleeve 27 normally inactive. In front of the clutch member 29 there isan eccentric 38, carried by the sleeve 27 and embraced by aneccentric-strap 39, from which rises a screw-threaded rod 40. Across-head 41 is slidably mounted upon the intermediate Screw-threadedportion of the rod 40 and is adjustably clamped thereon by means of apair of nuts 42, carried by the rod at opposite sides of the cross-head,whereby the latter may be adjusted vertically upon therod. The upperextremity of the rod is smooth and loosely pierces a cross-bar 43. Across-head 44 is carried by the hammer-bar and is adjustablelongitudinally thereon through the medium of the clip 45. At oppositesides of the hammer-bar and the rod 40 are guiderods 46, which looselypierce the corresponding terminals of the two cross-heads and theslidable cross bar 43, there being upper springs 47 embracing the rodsand interposed between the upper cross-head 44 and the nuts 48 upon thetops of the guide-rods, intermediate springs 49 being interposed betweenthe upper cross-heads and the slidable bar 43 and lower springs 50interposed between thelower cross-head 41 and the slidable bar. Nuts 51are fitted to the lower ends of the guide-rods 46 beneath the cross-head41. By this construction a vertically-swinging movement 1s imparted tothe hammer-bar from the driveshaft, and the hammer-bar is effectuallycushioned through the medium of the springs provided upon the guide-rods46. The tension of the springs may be conveniently regulated byadjustment of the nuts 48 and 51. To adjust the throw of the hammer-arm,the eccentric 38 may be adjusted longitudinally upon the sleeve 27 andis provided with a setscrew 52 for this purpose.

At one side of the hammer-bar, preferably the right-hand side thereofwhen looking at the front of the machine, are horizontallydisposed andvertically-alined rotatable mandrel-bars 53 and 54, extendinglongitudinally across the top of the bed and journaled at their rearends in vertically-spaced bearings 55 and 56, with their rearextremities projected beyond the bearings and provided with meshed gears57 and 58, the rear end of the lower roller or mandrel having a pulleyor sprocket-wheel 59. A belt or sprocket-chain 60 engages the sprocket59 and extends downwardly to a sprocket 61, loose upon the driveshaft 24in rear of the drive-pulley 26 and provided with a clutch member 62 foren-` gagement by a slidable clutch member 63, mounted upon the shaft.This clutch member is controlled by a vertically disposed swinging arm64, hung from a rock-shaft 65, which is provided at its outer end withasubstantially horizontal crank-arm 66. Beneaththe arm 66 there is atreadle 67, fulcrumed at its rear end upon the adjacent rearleg-standard and connected to the arm 66 by a link or rod 68, therebeing a spring 69 connected to the treadle and the bed of the machine toyieldably hold the treadle elevated with the slidable clutch member 63out of engagement with the clutch 61, whereby the rollers 53 and 54 arenormally inactive. In front of the crank-arm 66 is a lever 70, lyingbeneath the IOO IIO

yoke 73 and is capable of being drawn downy vcrank-arm 66 by a lin`k bedof the machine and fulcrumed thereto at its forward end, as indicated at71, the rear free end of the lever being connected to the 72. A yoke 73straddles the rollers 53 and 54 and the adjacent portion of the bed ofthe machine, the lower extremities of the sides of the yoke each beingpivoted to the lever 70, as indicated at 74. The upper end of the yokeconstitutes a bearing 75 for the forward portion ot' the upper roller53, while the lower roller -54 is supported in a stationary bearing 76,carried by the bed with its ends projected at the outer and inner edgesof the bed and each provided with an upstanding groove 77, constitutinga guideway for the adjacent member of the yoke. From this description itwill be understood that the upper roller 53 is normally supported at itsupper limit through the medium of the spring 69, the lever 70, and theinto coperative relation with the lower roller 54 by the manipulation ofthe treadle 67 to obtain the desired pressure and to accommodate therollers to tubes of diiferent sizes, which are designed to be Iittedupon the outer free end of the lower roller and rolled between the tworollers. The swinging movement of the upper roller 53 is comparativelyslight and is permitted by a suitable looseness of the roller in itsrear bearing 55. It will here be noted that the rollers 53 and 54 arethrown into rotation and the upper roller drawn down into cooperativerelation with the lower roller simultaneously by the manipulation of thetreadle 67, which materially simplifies the controlling of theserollers.

rlhe tube-cutting means is supported upon the top of the bed of themachine at the opposite side of the hammer-bar and includes a roller orspindle 78, journaled in an intermediate bearing 79 and a rear bearing80, carried by the top of the frame. 'lhis mandrel or roller projects inrear oi the bearing 80 and is provided with a pulley or sprocket 81,from which leads an endless belt or sprocketchain 82 to a terminalsprocket 83, loosely7 carried by the rear extremity of the driveshaftand capable ot' being {ixed thereon by a movable clutch member 84. Theclutch member 84 is controlled by an upright swinging arm 85, hung froma rock-shaft 86, journaled upon an upper cross-bar 87, extending'between the rear leg-standards of the frame of the machine. The outerend o1 the rockshat't 86 is provided with a substantially hori- `zontalcrank-arm 88, projected forwardly bethere being a spring 93 connectedtof the treadle and also to the bed of the machine to yieldably supportthe treadle in an elevated position, and thereby hold the clutch 84 outof engagement with the sprocket 83, so as to render the spindle ormandrel 78 normally inactive. Above the treadle 90 is a lever 94,fulcrumed intermediately, as at 95, to the bed oi' the machine, with itsrear end connected with the crank-arm 88 by a link 96. rlhe forward endof this lever is connected to the upright shank or stem 97 of ayoke-shaped bracket 98, which carries a pair of parallelantifriction-rollers 99, 'with the intervals between the rollers alinedbeneath the forward end o'f the mandrel 78, which carries thecutting-disk 100. The bracket-98 normally rests within a seat ordepression 101 in the front portion of the bed oi the machine, and thecrank or stem 97 has beveled longitudinal edges to fit in an uprightdovetailed groove or guideway 102, formed in the front end of the bedand intersecting the seat 101, so as to prevent lateral displacement ot'the bracket. A 'set collar 103 adjustably embraces the mandrel 78 and isprovided with a set-screw 104 to adjustably tix the collar thereon,whereby the extent of the insertion ot' the cutter end of the mandrelinto a tube may be regulated by adjustment of the set-collar, whichforms a stop for engagement by the front end of the tube to be cut.

From the foregoing description it will be noted that the tube-rollingmandi-els, the mandrel or anvil of the hammer, and the tubecutter areall accessible at the l'ront olE the machine and are individuallycontrollable from the front of the machine through the mediumbt' thetreadles, which are accessible to a workman working at either of thedevices. Each of the tools is controllable independently of the other,and all three of them may be in operation at the same time.

Having thus described the construction and operation of our invention,what we claim as new, and desire to secure by Letters Patent, 1s-

1. In a metal-working machine, the combination with a frame, of adrive-shaft carried thereby, a hammer-bar fulcrunied upon the frame, aneccentric carried by the shaft, an eccentric-strap, a connecting-rodrising from the strap and provided with a lower crosshead and an Lipperslidable cross-bar, acrosshead carried by the hammer-bar, guide-rodsconnected to the cross-head of the rod and loosely piercing the slidablecross-bar and the cross-head of the hammer-bar, and springs interposedbetween the lower cross-head and the slidable cross-bar, the slidablecross-bar and the cross-head of the hammer-bar and above the lattercross-head, and nuts upon the upper ends of the guide-rods to vary thetension of the springs.

2. In a metal-working machine, the combi- TOO nation with a frame, of adrive-shaft mounted thereon, a hammenbar ulcrumed upon the frame, aneccentric upon the shaft, an eccentric-strap, a connecting-rod risingfrom the strap, corresponding cross-heads carried by the connecting-rodand the hammer-bar respectively, guide-rods carried by the crosshead ofthe connectingrod and working loosely through the cross-head of thehammerbar, springs embracing the guide-rods between the cross-heads andalso above the upper cross-head, and means to vary the tension of theupper springs.

V3. In a metal-working machine, the combination with a frame, ofadrive-shaft mounted thereon, a hammer-bar fulcrumed upon the frame, aneccentric upon the shaft, an eccentric-strap, a connecting-rod risingfrom the strap, cross-heads carried by the connectingrod and thehammer-bar, guide-rods carried by the lower cross-head and looselypiercing the upper cross-head, springs embracing the rods below andabove the upper cross-head, and a stop for the upper ends of the uppersprings.

4. In a metal-working machine, the combination with a frame, of adrive-shaft carried thereby, a hammer-bar fulcrumed upon the frame aboveand in substantial parallelism with the shaft, an eccentric adjustablelongitudinally upon the shaft, an eccentric-strap, a connecting-rodrising from the strap, and means adjustable longitudinally upon thehammer-bar and connected to the connectingrod to vary the throw of thehammer-bar.

5. In a metal-working machine, the combination with a frame, of adrive-shaft mounted thercon,avertically-adjustable bracketcarried by theframe above the shaft, a hammer-bar fulcrurned upon the bracket insubstantial parallelism with the shaft, an eccentric adjustablelongitudinally upon the shaft, an eccentricstrap, a connecting-rodrising from the strap, a cross-head adjustable longitudinally upon theconnecting-rod, a cross-head adjustable longitudinally upon thehammer-bar, and connecting means extending between the two cross-heads.

In testimony that we claim the foregoing as our own we have heretoailiXed our signatures in the presence of two witnesses.

OLE P. MIKLEBOST. ANTON Gr. ANDERSON. Nitnessesz WM. H. NELSON, A. I.ENGEBRETSON.

